20. The Lord also said to Moses: "Arise at first light, and stand in the sight of Pharaoh, for he will go out to the waters. And you will say to him: 'Thus says the Lord: Release my people to sacrifice to me.
21. But if you will not release them, behold, I will send upon you, and upon your servants, and upon your people, and into your houses, diverse kinds of flies. And the houses of the Egyptians will be filled with diverse kinds of flies, as well as the whole land in which they will be.
22. And in that day, I will cause a miracle in the land of Goshen, where my people are, so that flies will not be there. And you will know that I am the Lord in the midst of the earth.
23. And I will set a division between my people and your people. Tomorrow this sign will be.' "
24. And the Lord did so. And there came very grievous flies into the houses of Pharaoh and of his servants, and into all the land of Egypt. And the land was polluted, in this way, by the flies.
25. And Pharaoh called Moses and Aaron, and he said to them, "Go and sacrifice to your God in this land."
26. And Moses said: "It cannot be so. For we will immolate the abominations of the Egyptians to the Lord our God. For if we slaughter those things which the Egyptians worship, in their presence, they will stone us.
27. We will sojourn three days' journey into the wilderness. And we will sacrifice to the Lord our God, just as he has instructed us."
28. And Pharaoh said: "I will release you in order to sacrifice to the Lord your God in the desert. Yet you may only go so far. Petition for me."
29. And Moses said: "After departing from you, I will pray to the Lord. And the flies will withdraw from Pharaoh, and from his servants, and from his people, tomorrow. Yet do not be willing to deceive any longer, so that you would not release the people to sacrifice to the Lord."
30. And Moses, departing from Pharaoh, prayed to the Lord.